Synthesis of 3,4-bridged indoles by photocyclisation reactions. Part 1. Photocyclisation of halogenoacetyl tryptophan derivatives
作者:Anthony L. Beck、Mark Mascal、Christopher J. Moody、Alexandra M. Z. Slawin、David J. Williams、William J. Coates
DOI:10.1039/p19920000797
日期:——
results in a poor yield of photocyclisation to the indole 4-position due to competing cyclisation to C-2, the photocyclisation of (dichloroacetyl)tryptophan derivatives gives, after addition of a nucleophile in work-up, 7-substituted pyrrolobenzazocines in good yield and with trans-stereospecificity. N-(Trichloroacetyl)tryptophan derivatives also undergo photocyclisation to give 3,4-bridged indoles
虽然照射Ñ在photocyclisation的产量很低,以吲哚4-位由于竞争环化至C-2 -chloroacetyltryptophan结果,(二氯乙酰基)色氨酸衍生物的photocyclisation给出,添加亲核试剂的后在后处理,7-以高收率和反立体特异性取代取代的吡咯并苯甲恶唑啉。N-(三氯乙酰基)色氨酸衍生物也经过光环化反应,生成3,4-桥连吲哚。所述azocinoindoles的结构13,21,22和35,以及azepinoindole 15进行了X射线晶体学确认。在一种情况下,制备环烷基[ c,d ]吲哚可以通过吲哚-3-基链烷酸的α-氯酰胺的照射而形成。